I think that there shouldn't be an extended cooldown for Druids who rest outside of an inn, as their connection to nature would allow them to feel comfortable resting in the wild. At the very least, maybe only extend it by 5 minutes (35 minute cooldown). As for Rangers, they should be somewhere in the middle, like maybe 45-50 minute cooldown in the wild instead 60. This could even be gated behind a class feat, so that taking 1 level of Ranger wouldn't be enough to receive this bonus.
